EP2226868B1 - Rechargeable battery and module thereof - Google Patents
Rechargeable battery and module thereof Download PDFInfo
- Publication number
- EP2226868B1 EP2226868B1 EP10155469A EP10155469A EP2226868B1 EP 2226868 B1 EP2226868 B1 EP 2226868B1 EP 10155469 A EP10155469 A EP 10155469A EP 10155469 A EP10155469 A EP 10155469A EP 2226868 B1 EP2226868 B1 EP 2226868B1
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- circuit
- electrode terminal
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- 230000008961 swelling Effects 0.000 claims abstract description 35
- 238000007789 sealing Methods 0.000 claims abstract description 8
- 230000006698 induction Effects 0.000 claims description 27
- 239000012212 insulator Substances 0.000 claims description 22
- 230000004888 barrier function Effects 0.000 claims description 15
- 239000003792 electrolyte Substances 0.000 description 4
- 239000011149 active material Substances 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 235000015110 jellies Nutrition 0.000 description 1
- 239000008274 jelly Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Images
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/572—Means for preventing undesired use or discharge
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/572—Means for preventing undesired use or discharge
- H01M50/574—Devices or arrangements for the interruption of current
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
- H01M50/103—Primary casings; Jackets or wrappings characterised by their shape or physical structure prismatic or rectangular
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/116—Primary casings; Jackets or wrappings characterised by the material
- H01M50/117—Inorganic material
- H01M50/119—Metals
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/172—Arrangements of electric connectors penetrating the casing
- H01M50/174—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells
- H01M50/176—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells for prismatic or rectangular cells
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/543—Terminals
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/543—Terminals
- H01M50/547—Terminals characterised by the disposition of the terminals on the cells
- H01M50/55—Terminals characterised by the disposition of the terminals on the cells on the same side of the cell
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/543—Terminals
- H01M50/552—Terminals characterised by their shape
- H01M50/553—Terminals adapted for prismatic, pouch or rectangular cells
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2200/00—Safety devices for primary or secondary batteries
- H01M2200/20—Pressure-sensitive devices
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Definitions
- the short-circuit unit may further include a bracket connected to the case and supporting the short-circuit end, and an insulating member between the short-circuit end and the bracket.
- the short-circuit unit 40 includes a swelling induction unit 41 formed on the third surface 143 of the case 14 and a short-circuit member 42.
- the swelling induction unit 41 is formed on the case 14, and the short-circuit member 42 faces the swelling induction unit 41 and is connected to the negative electrode terminal 12.
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Connection Of Batteries Or Terminals (AREA)
- Secondary Cells (AREA)
- Battery Mounting, Suspending (AREA)
- Sealing Battery Cases Or Jackets (AREA)
Abstract
Description
- Embodiments of the present invention relate to a rechargeable battery and a module thereof, and more particularly, to a rechargeable battery and a module thereof that can prevent or reduce overcharge.
- A large-capacity rechargeable battery may be used as a power supply for driving a motor of an electric vehicle or a hybrid electric vehicle (HEV). A large-capacity rechargeable battery is typically provided with a plurality of rechargeable batteries consisting of unit cells and is formed by connecting the unit cells to each other in series.
- A large-capacity rechargeable battery may have a circular or a prismatic shape. The prismatic shape generally provides a better heat radiating performance than the circular shape. Therefore, the prismatic shape is more advantageous than the circular shape with respect to the aspect of safety against overcharge. As a result, circular rechargeable batteries are typically provided with a current interrupt device (CID) for interrupting current in overcharge, while prismatic rechargeable batteries are typically not provided with a CID. However, in
JP 2004 319 463 A - However, recently, because the rechargeable battery adopted in the HEV, the plug-in hybrid electric vehicle (PHEV), and the electric vehicle is required to have high capacity, the size of the rechargeable battery may increase. In the case of the prismatic shape, a difference in heat radiation may be caused inside and outside of the unit cell due to an increase of a thickness thereof, such that safe charging may be difficult to provide.
- The above information disclosed in this Background section is only for enhancement of understanding of the background of the invention and therefore it may contain information that does not form the prior art that is already known in this country to a person of ordinary skill in the art.
- Embodiments of the present invention provide a unit cell, a rechargeable battery and a module thereof for preventing or reducing overcharge.
- Embodiments of the present invention provide a unit cell, a rechargeable battery and a module thereof for providing stability from overcharge in a prismatic rechargeable battery having increased thickness.
According to a first aspect, the present invention is directed to a unit cell as defined in the claims comprising a case containing an electrode assembly; a cap plate coupled to the case and sealing an opening of the case; a first electrode terminal connected to a first electrode of the electrode assembly and electrically connected to the case; a second electrode terminal connected to a second electrode of the electrode assembly and electrically insulated from the case when a pressure inside the case is less than a threshold pressure; and a short-circuit unit comprising a short-circuit member connected to the second electrode terminal, the short-circuit unit adapted to short-circuit the second electrode terminal to the case by swelling a portion of the case to contact the short-circuit member when the pressure inside the case is equal to or greater than the threshold pressure.
The case of the unit cell of the invention can have a prismatic hexahedron shape, and the short-circuit unit can be on a surface of the case. The case can comprise a first surface and a second surface facing each other and each having a substantially same first area; a third surface and a fourth surface facing each other and being between the first and second surfaces, each of the third and fourth surfaces having a substantially same second area smaller than the first area; and a fifth surface facing the opening and having a width substantially equal to a width of the third and fourth surfaces. In a preferred embodiment of the unit cell of the invention, the first surface or the second surface extends in a first direction and includes cell barriers spaced from each other in a second direction that crosses the first direction, the cell barriers defining at least one flow passage therebetween for passage of a heat transfer medium therethrough.
The short-circuit unit of the unit cell of the invention can be located on the third surface or the fourth surface of the can.
The unit cell of the ivention can further comprise an insulating layer on outer surfaces of the case other than the surface having the short-circuit unit thereon.
Furthermore, the unit cell of the invention can further comprise an insulating layer on outer surfaces of the cell barriers.
In the unit cell of the invention, the short-circuit unit further comprises a swelling induction unit comprising the portion of the case, the portion of the case having a thickness (T2) that is less than a thickness (T1) of another portion of the case surrounding the portion, and wherein the short-circuit member faces and is contactable with an outer surface of the potion of the case. Preferably, the swelling induction unit is concave on an inner surface of the portion of the case, and the short-circuit member comprises a mounting portion mounted to the second electrode terminal and a short-circuit end facing and contactable with the swelling induction unit.
In the unit cell of the invention, the short-circuit member can be bent between the mounting portion and the short-circuit end, the mounting portion being substantially horizontal, and the short-circuit end being substantially vertical. The short-circuit unit may further comprise a bracket connected to the case and supporting the short-circuit end, and an insulating member between the short-circuit end and the bracket.
In a preferred embodiment, the unit cell of the invention further comprises an outer insulator on at least an outer surface of the cap plate; and an inner insulator on an inner surface of the cap plate, wherein the outer and inner insulators receive one of the first and second electrode terminals therethrough and electrically insulate the one of the first and second electrode terminals from the cap plate. - A rechargeable battery according to one exemplary embodiment of the present invention includes a case containing an electrode assembly; a cap plate coupled to the case and sealing an opening of the case; a first electrode terminal connected to a first electrode of the electrode assembly and electrically connected to the case; a second electrode terminal connected to a second electrode of the electrode assembly and electrically insulated from the case when a pressure inside the case is less than a threshold pressure; and a short-circuit unit including a short-circuit member connected to the second electrode terminal, the short-circuit unit adapted to short-circuit the second electrode terminal to the case by swelling a portion of the case to contact the short-circuit member when the pressure inside the case is equal to or greater than the threshold pressure. The case may have a prismatic hexahedron shape and the short-circuit unit may be on a surface of the case.
- The case may include a first surface and a second surface facing each other and each having a substantially same first area; a third surface and a fourth surface facing each other and being between the first and second surfaces, each of the third and fourth surfaces having a substantially same second area smaller than the first area; and a fifth surface facing the opening and having a width substantially equal to a width of the third and fourth surfaces. The short-circuit unit may be on the third surface or the fourth surface. The rechargeable battery may further include an insulating layer on outer surfaces of the case other than the surface having the short-circuit unit thereon.
- The first surface or the second surface may extend in a first direction and include cell barriers spaced from each other in a second direction that crosses the first direction, the cell barriers defining at least one flow passage therebetween for passage of a heat transfer medium therethrough. The rechargeable battery may further include an insulating layer on outer surfaces of the cell barriers.
- The short-circuit unit includes a swelling induction unit including the portion of the case, the portion of the case having a thickness that is less than a thickness of another portion of the case surrounding the portion, and the short-circuit member may face and be contactable with an outer surface of the portion of the case.
- The swelling induction unit may be concave on an inner surface of the portion of the case, and the short-circuit member may include a mounting portion mounted to the second electrode terminal, and a short-circuit end facing and contactable with the swelling induction unit. The short-circuit member may be bent between the mounting portion and the short-circuit end, the mounting portion being substantially horizontal, and the short-circuit end being substantially vertical.
- The short-circuit unit may further include a bracket connected to the case and supporting the short-circuit end, and an insulating member between the short-circuit end and the bracket.
- The first electrode terminal may be a positive electrode terminal, and the second electrode terminal may be a negative electrode terminal.
- The rechargeable battery may include an outer insulator on at least an outer surface of the cap plate, and an inner insulator on an inner surface of the cap plate, and the outer and inner insulators may receive one of the first and second electrode terminals therethrough and electrically insulate the one of the first and second electrode terminals from the cap plate.
- A rechargeable battery module according to another embodiment of the present invention includes a plurality of unit cells adjacent one another, and at least one bus bar connecting unit cells of the plurality of unit cells to each other in series, wherein a unit cell of the plurality of unit cells includes a case containing an electrode assembly; a cap plate coupled to the case and sealing an opening of the case; a first electrode terminal connected to a first electrode of the electrode assembly and electrically connected to the case; a second electrode terminal connected to a second electrode of the electrode assembly and electrically insulated from the case when a pressure inside the case is less than a threshold pressure; and a short-circuit unit including a short-circuit member connected to the second electrode terminal, the short-circuit unit adapted to short-circuit the second electrode terminal to the case by swelling a portion of the case to contact the short-circuit member when the pressure inside the case is equal to or greater than the threshold pressure.
- As such, according to an exemplary embodiment of the present invention, an insulating layer is on an outer surface of a case, one electrode terminal is electrically connected to the case, and a short-circuit unit is adapted to short-circuit another electrode terminal and the case by swelling the case, thereby preventing or reducing overcharging. That is, since charged current is discharged by the short-circuit while charging is continuous without current interruption, an increase of voltage and temperature can be prevented or reduced.
The present invention also refers to A rechargeable battery module comprising a plurality of unit cells adjacent one another; and at least one bus bar connecting unit cells of the plurality of unit cells to each other in series, wherein a unit cell of the plurality of unit cells comprises a case containing an electrode assembly; a cap plate coupled to the case and sealing an opening of the case; a first electrode terminal connected to a first electrode of the electrode assembly and electrically connected to the case; a second electrode terminal connected to a second electrode of the electrode assembly and electrically insulated from the case when a pressure inside the case is less than a threshold pressure; and a short-circuit unit comprising a short-circuit member connected to the second electrode terminal, the short-circuit unit adapted to short-circuit the second electrode terminal to the case by swelling a portion of the case to contact the short-circuit member when the pressure inside the case is equal to or greater than the threshold pressure.
In the rechargeable battery module of the invention, the short-circuit unit comprises a swelling induction unit comprising a portion of the case, the portion of the case having a thickness that is less than a thickness of another portion of the case surrounding the portion, and wherein the short-circuit member faces and is contactable with an outer surface of the portion of the case.
In the rechargeable battery module of the invention, wherein the swelling induction unit can be concave on an inner surface of the portion of the case, and the short-circuit member can comprise a mounting portion mounted to the second electrode terminal, and a short-circuit end facing and contactable with the swelling induction unit.
In a preferred embodiment of the rechargeable battery module, the short-circuit member can be bent between the mounting portion and the short-circuit end, the mounting portion being substantially horizontal, and the short-circuit end being substantially vertical.
In the rechargeable battery module of the invention, the short-circuit unit can further comprise a bracket connected to the case and supporting the short-circuit end, and an insulating member between the short-circuit end and the bracket.
In the rechargeable battery module of the invention, the unit cell of the plurality of unit cells can further comprise an insulating layer on an outer surface of the case.
In a preferred embodiment,the first electrode terminal of the unit cell of the rechargeable battery module is a positive electrode terminal, and the second electrode terminal of the unit cell is a negative electrode terminal. -
FIG. 1 is a perspective view of a rechargeable battery module according to an exemplary embodiment of the present invention. -
FIG. 2A is a cross-sectional view of a unit cell of the rechargeable battery module ofFIG. 1 taken along line II-II before operation of a short circuit unit of the rechargeable battery module. -
FIG. 2B is a cross-sectional view of a unit cell of the rechargeable battery module ofFIG. 1 taken along line II-II after operation of a short circuit unit of the rechargeable battery module. -
FIG. 3 is a plan view of the rechargeable battery module ofFIG. 1 . -
FIG. 4A is a cross-sectional view of a short-circuit unit of the rechargeable battery module ofFIG. 1 before operation. -
FIG. 4B is a cross-sectional view of a short-circuit unit of the rechargeable battery module ofFIG. 1 after operation. -
10 : Unit cell 100 : Rechargeable battery module 11, 12 : Positive and negative electrode terminals 111, 121 : Nuts 13 : Electrode assembly 14 : Case 141, 142, 143, 144, 145 : First to fifth surfaces of case 146 : Cell barrier 147 : Flow passage 15 : Cap plate 151 : Sealing closure 152 : Vent portion 153 : Terminal hole of cap plate 16, 17 : Outer and inner insulators 18 : Insulating layer 19 : Connecting member 20 : Bus bar 21 : Terminal hole of bus bar 31, 32 : Positive and negative electrodes 31 a, 32a : Uncoated region 33 : Separator 34 : Current collecting member 40 : Short-circuit unit 41 : Swelling induction unit 42 : Short-circuit member 421 : Mounting portion 422 : Short-circuit end 43 : Bracket 44 : Insulating member T1, T2 : First and second thicknesses - Hereinafter, the present invention will be described more fully with reference to the accompanying drawings, in which exemplary embodiments of the invention are shown. Accordingly, the drawings and description are to be regarded as illustrative in nature and not restrictive. Like reference numerals designate like elements throughout the specification.
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FIG. 1 is a perspective view of a rechargeable battery module according to an exemplary embodiment of the present invention. Referring toFIG. 1 , arechargeable battery module 100 according to one exemplary embodiment includes two ormore unit cells 10 that are sequentially disposed adjacent to each other and one ormore bus bars 20 connecting theunit cells 10 to each other in series. - The
bus bar 20 connects apositive electrode terminal 11 of one of theunit cells 10 with anegative electrode terminal 12 of another adjacent one of theunit cells 10 in series to form the high-outputrechargeable battery module 100. An output of therechargeable battery module 100 is dependent on the number ofunit cells 10 that are connected to each other in series. -
FIG. 2A is a cross-sectional view of one of theunit cells 10 of therechargeable battery module 100 taken along line II-II ofFIG. 1 before operation of a short circuit unit of the rechargeable battery module, andFIG. 2B is a cross-sectional view of one of theunit cells 10 of therechargeable battery module 100 taken along line II-II ofFIG. 1 after operation of a short circuit unit of the rechargeable battery module.FIG. 3 is a plan view of therechargeable battery module 100. Referring toFIGS. 2A ,2B and3 , theunit cells 10 form therechargeable battery module 100 that includes thepositive electrode terminal 11 and thenegative electrode terminal 12. - In one embodiment, each of the
unit cells 10 includes anelectrode assembly 13 that is connected to thepositive electrode terminal 11 and thenegative electrode terminal 12, acase 14 that contains theelectrode assembly 13 and is electrically connected to thepositive electrode terminal 11 via a connecting member 19 (shown inFIG. 2A ), acap plate 15 that covers an opening formed at one side of thecase 14, anouter insulator 16 that is installed on an outer surface of thecap plate 15, and one or moreinner insulators 17 that are installed on an inner surface of thecap plate 15. - The
unit cell 10, in one embodiment, further includes an insulatinglayer 18 that is formed on an outer surface of thecase 14. The insulatinglayer 18 may be formed by an insulating sheet that is attached with an insulating material or by an insulation coated layer that is coated with an insulating material. Theunit cell 10 further includes a short-circuit unit 40 configured to short-circuit thenegative electrode terminal 12 to thecase 14 by swelling of thecase 14, in which a portion of thecase 14 swells in an overcharge condition. - The
electrode assembly 13 may be formed in a jelly roll shape by disposing apositive electrode 31 and anegative electrode 32 on both surfaces of aseparator 33, respectively, and winding thepositive electrode 31, thenegative electrode 32, and theseparator 33 all together. - Each of the
positive electrode 31 and thenegative electrode 32 may include a coated region where a current collector formed of a thin metal foil is coated with an active material and anuncoated region - The
uncoated regions positive electrode 31 and thenegative electrode 32, respectively, in longitudinal directions of thepositive electrode 31 and thenegative electrode 32 and at side ends opposite to each other. Theuncoated regions positive electrode terminal 11 and thenegative electrode terminal 12, respectively, through respective current collectingmembers 34. - The
case 14 forms an entire exterior of theunit cell 10 and is made of a conductive metal such as aluminum, an aluminum alloy, or nickel-plated steel. Thecase 14 forms a space incorporating theelectrode assembly 13. For example, thecase 14 may have a prismatic hexahedron shape. - In one embodiment, the
case 14 includes a pair of first andsecond surfaces 141 and 142 (seeFIG. 3 ), each having a substantially same area (e.g., an area formed by a length and a height of the case 14) and facing each other; a pair of third andfourth surfaces second surfaces second surfaces fifth surface 145 at another side between the first andsecond surfaces second surfaces fifth surface 145 forms a side of thecase 14 opposite to an opening of thecase 14. - The
cap plate 15 may be formed of a thin plate and is joined to the opening formed at one side of thecase 14 and seals the opening. Thecap plate 15 may have an electrolyte injection opening (not shown) for injecting an electrolyte into the inside of the sealedcase 14. - The electrolyte injection opening is sealed with a
sealing closure 151 after injecting the electrolyte. Thecap plate 15 may have avent portion 152 cut depending on an internal pressure set to prevent explosion of theunit cell 10. - The
cap plate 15 has a pair ofterminal holes 153 that each receive one of thepositive electrode terminal 11 and thenegative electrode terminal 12 therethrough. Thepositive electrode terminal 11 and thenegative electrode terminal 12 are joined to the terminal holes 153 of thecap plate 15 to be connected to a respective current collectingmember 34 in thecase 14 and be connected to theelectrode assembly 13 through the current collectingmember 34. - In one embodiment, the
outer insulator 16 is partially inserted into theterminal hole 153 of thenegative electrode terminal 12 outside of thecap plate 15 to electrically insulate thenegative electrode terminal 12 from thecap plate 15. That is, theouter insulator 16 insulates thenegative electrode terminal 12 from the outer surface of thecap plate 15 and, at the same time, insulates thenegative electrode terminal 12 from an inner surface of theterminal hole 153 of thecap plate 15 of thenegative electrode terminal 12. In an exemplary embodiment of theouter insulator 16, a part corresponding to the outer surface of thecap plate 15 and a part corresponding to the inner surface of theterminal hole 153 are integrally formed, but may alternatively be formed separate from each other (not shown). - The
bus bar 20 is provided with a pair ofterminal holes 21 that correspond to thepositive electrode terminal 11 and thenegative electrode terminal 12 of theadjacent unit cells 10. Thebus bar 20 is installed on theouter insulator 16 of each of theadjacent unit cells 10 by inserting thepositive electrode terminal 11 and thenegative electrode terminal 12 through the terminal holes 21.Nuts positive electrode terminal 11 and thenegative electrode terminal 12, respectively, such that thebus bar 20 connects thepositive electrode terminal 11 and thenegative electrode terminal 12 to each other in series in a pair ofunit cells 10. In the described embodiment, theouter insulator 16 supports thebus bar 20 and is between thecap plate 15 and the bus bar 20 (seeFIG. 2A ). - The
inner insulators 17 are provided to correspond to the terminal holes 153 inside of thecap plate 15 and electrically insulate thecurrent collecting members 34 from thecap plate 15 on the inner surface of thecap plate 15. In one embodiment, each of a pair ofcurrent collecting members 34 connects thepositive electrode 31 and thenegative electrode 32 of theelectrode assembly 13 to thepositive electrode terminal 11 and thenegative electrode terminal 12, respectively. - In the
unit cell 10 of an exemplary embodiment, thepositive electrode terminal 11 is electrically connected to thecase 14 through the connectingmember 19, but thenegative electrode terminal 12 and thecase 14 are insulated from each other for normal operation of theunit cell 10. The connectingmember 19 may be made of conductive material such as copper or aluminum. - Further, in other embodiments of the
unit cell 10, thenegative electrode terminal 12 may be electrically connected to thecase 14 and thepositive electrode terminal 11 and thecase 14 may be insulated from each other (not shown). In these embodiments, in an overcharge condition, the short-circuit unit 40 may short-circuit thepositive electrode terminal 11 and thecase 14 to each other. - When the
unit cell 10 is overcharged (seeFIGs. 2B and4B ) and deviating from a normal operating range (seeFIGs. 2A and4A ), the short-circuit unit 40 short-circuits thenegative electrode terminal 12 to thecase 14. As a result, while current charging is continuous, the short-circuit unit 40 discharges current by electrically connecting thecase 14 and thenegative electrode terminal 12, thereby preventing additional increases of voltage and temperature of theunit cell 10. As a result, safety of theunit cell 10 from overcharge is secured. - The
outer insulator 16 and theinner insulator 17 insulate thenegative electrode terminal 12 and thecase 14 from each other, and the short-circuit unit 40 selectively short-circuits thenegative electrode terminal 12 and thecase 14 to each other in an overcharge condition. As such, theouter insulator 16 and theinner insulator 17 and the short-circuit unit 40 perform opposite functions. - In an exemplary embodiment, the short-
circuit unit 40 is formed on one surface of thecase 14, that is, either one of the third andfourth surfaces layer 18 is formed on other surfaces of thecase 14 where the short-circuit unit 40 is not formed. In one exemplary embodiment, the short-circuit unit 40 is formed on thethird surface 143 of thecase 14 and the insulatinglayer 18 is formed on the first, second, fourth, andfifth surfaces layer 18 may be further formed on a part of thethird surface 143 except for a part corresponding to the short-circuit unit 40 (not shown). - Further, in one embodiment, either one of the first and
second surfaces 141 and 142 (e.g., thefirst surface 141, as shown inFIG. 3 ) is provided withcell barriers 146 to formflow passages 147 therebetween for passage of a heat transmission medium. Thecell barriers 146 extend in a first direction (e.g., along the z-axis direction ofFIG. 3 ) and are spaced from each other at a predetermined interval in a second direction (e.g., the x-axis direction ofFIG. 3 ) that crosses the z-axis direction. - That is, each of the
flow passages 147 is formed as a space between adjacent ones of thecell barriers 146 that are formed on thefirst surface 141 of oneunit cell 10 of twoadjacent unit cells 10 and thesecond surface 142 of theother unit cell 10 of the twoadjacent unit cells 10. - Further, the insulating
layer 18 formed on thefirst surface 141 is also formed on outer surfaces of thecell barriers 146 formed on thefirst surface 141. The insulatinglayer 18 formed on thecell barriers 146 prevents thecases 14 that are electrically connected to thepositive electrode terminal 11 in theadjacent unit cells 10 from being connected in series. - The short-
circuit unit 40 includes aswelling induction unit 41 formed on thethird surface 143 of thecase 14 and a short-circuit member 42. Theswelling induction unit 41 is formed on thecase 14, and the short-circuit member 42 faces theswelling induction unit 41 and is connected to thenegative electrode terminal 12. -
FIGS. 4A and4B are cross-sectional views of the short-circuit unit 40 of therechargeable battery module 100 before and after operation (e.g., due to an overcharge condition), respectively. Referring toFIG. 4A , theswelling induction unit 41 is formed on thethird surface 143 of thecase 14 and has a second thickness T2 that is thinner than a first thickness T1 of the surrounding portions of the third surface 143 (see alsoFIG. 2A ). As a result, when an internal pressure inside thecase 14 increases, the first tofifth surfaces 141 to 145, including the portion of thethird surface 143 having the first thickness T1, are not expanded, but theswelling induction unit 41 of thethird surface 143 may be expanded, or bulged, before the other surfaces (seeFIGs. 2B and4B ). For example, theswelling induction unit 41 is concave on an inner surface of thethird surface 143 and is configured to bulge outwardly in the region having the second thickness T2 due to the internal pressure. - The short-
circuit member 42 is electrically connected to thenegative electrode terminal 12 at one side thereof and faces an outer surface of theswelling induction unit 41 at the other side thereof. That is, in one embodiment, the short-circuit member 42 includes a mountingportion 421 that is mounted on thenegative electrode terminal 12 and a short-circuit end 422 that faces theswelling induction unit 41, and the short-circuit member 42 is bent between the mountingportion 421 and the short-circuit end 422 (e.g., bent from a horizontal orientation at the mountingportion 421 to a vertical orientation at the short-circuit end 422). Therefore, when theswelling induction unit 41 is expanded, or bulged, the portion of thethird surface 143 having the second thickness T2, that is, theswelling induction unit 41, and the short-circuit member 42 may be electrically short-circuited to each other. That is, when theswelling induction unit 41 and the short-circuit end 422 are short-circuited to each other, each of thenegative electrode terminal 12, the mountingunit 421, the short-circuit end 422, and theswelling induction unit 41 are electrically connected to each other. As a result, since theswelling induction unit 41 is electrically connected to thepositive electrode terminal 11 on thethird surface 143 of thecase 14, thepositive electrode terminal 11 and thenegative electrode terminal 12 are short-circuited to each other. Accordingly, since charged current is discharged through the short-circuit member 42 even though charging is continuous in theunit cell 10, safety against overcharge is secured. - Further, the short-
circuit unit 40 may include abracket 43 and an insulatingmember 44. Thebracket 43 is connected to thethird surface 143 of thecase 14 to stably support the short-circuit end 422, thereby preventing the short-circuit end 422 from being unnecessarily short-circuited to theswelling induction unit 41. The insulatingmember 44 is interposed between the portion of the short-circuit end 422 penetrating thebracket 43 and thebracket 43 to electrically insulate the short-circuit end 422 and thebracket 43 from each other.
Claims (14)
- A unit cell (10) comprising:a case (14) containing an electrode assembly (13);a cap plate (15) coupled to the case (14) and sealing an opening of the case (14);a first electrode terminal (11) connected to a first electrode (31) of the electrode assembly (13) and electrically connected to the case (14);a second electrode terminal (12) connected to a second electrode (32) of the electrode assembly (13) and electrically insulated from the case (14) when a pressure inside the case (14) is less than a threshold pressure; anda short-circuit unit (40) comprising a short-circuit member (42) connected to the second electrode terminal (12), the short-circuit unit (40) adapted to short-circuit the second electrode terminal (12) to the case (14) by swelling a portion of the case (14) to contact the short-circuit member (42) when the pressure inside the case (14) is equal to or greater than the threshold pressure,wherein the short-circuit unit (40) further comprises a swelling induction unit (41) comprising the portion of the case (14), the portion of the case (14) having a thickness (T2) that is less than a thickness (T1) of another portion of the case (14) surrounding the portion, and wherein the short-circuit member (42) faces and is contactable with an outer surface of the portion of the case (14).
- The unit cell (10) of claim 1, wherein the case (14) has a prismatic hexahedron shape, and the short-circuit unit (40) is on a surface of the case (14).
- The unit cell (10) of claim 1 or 2, wherein the case (14) comprises:a first surface (141) and a second surface (142) facing each other and each having a substantially same first area;a third surface (143) and a fourth surface (144) facing each other and being between the first (141) and second (142) surfaces, each of the third (143) and fourth (144) surfaces having a substantially same second area smaller than the first area; anda fifth surface (145) facing the opening and having a width substantially equal to a width of the third (143) and fourth (144) surfaces.
- The unit cell (10) of claim 3, wherein the short-circuit unit (40) is on the third surface (143) or the fourth surface (144).
- The unit cell (10) of one of claims 1 to 4, further comprising an insulating layer (18) on outer surfaces of the case (14) other than the surface having the short-circuit unit (40) thereon.
- The unit cell (10) of one of claims 3 to 5, wherein the first surface (141) or the second surface (142) extends in a first direction and includes cell barriers (146) spaced from each other in a second direction that crosses the first direction, the cell barriers (146) defining at least one flow passage (147) therebetween for passage of a heat transfer medium therethrough.
- The unit cell (10) of claim 6, further comprising an insulating layer (18) on outer surfaces of the cell barriers (146).
- The unit cell (10) of claim 1, wherein the swelling induction unit (41) is concave on an inner surface of the portion of the case (14), and wherein the short-circuit member (42) comprises a mounting portion (421) mounted to the second electrode terminal (12), and a short-circuit end (422) facing and contactable with the swelling induction unit (41).
- The unit cell (10) of claim 1 or 8, wherein the short-circuit member (42) is bent between the mounting portion (421) and the short-circuit end (422), the mounting portion (421) being substantially horizontal, and the short-circuit end (422) being substantially vertical.
- The unit cell (10) of one of claims 1, 8 or 9, wherein the short-circuit unit (40) further comprises a bracket (43) connected to the case (14) and supporting the short-circuit end (422), and an insulating member (44) between the short-circuit end (422) and the bracket (43).
- The unit cell (10) of one of claims 1 to 10, wherein the first electrode terminal (11) is a positive electrode terminal, and the second electrode terminal (12) is a negative electrode terminal.
- The unit cell (10) of one of claims 1 to 11, further comprising:an outer insulator (16) on at least an outer surface of the cap plate (15); andan inner insulator (17) on an inner surface of the cap plate (15),wherein the outer (16) and inner (17) insulators receive one of the first (11) and second (12) electrode terminals therethrough and electrically insulate the one of the first (11) and second (12) electrode terminals from the cap plate (15).
- A rechargeable battery comprising a unit cell (10) according ot one of claims 1 to 12.
- A rechargeable battery module comprising:a plurality of unit cells adjacent one another; andat least one bus bar connecting unit cells of the plurality of unit cells to each other in series,wherein a unit cell of the plurality of unit cells is a unit cell according to one of claims 1 to 12.
Applications Claiming Priority (1)
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KR1020090018604A KR101041153B1 (en) | 2009-03-04 | 2009-03-04 | Rechargeable battery and module thereof |
Publications (2)
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EP2226868A1 EP2226868A1 (en) | 2010-09-08 |
EP2226868B1 true EP2226868B1 (en) | 2011-10-05 |
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EP10155469A Active EP2226868B1 (en) | 2009-03-04 | 2010-03-04 | Rechargeable battery and module thereof |
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US (1) | US8557418B2 (en) |
EP (1) | EP2226868B1 (en) |
JP (1) | JP5256231B2 (en) |
KR (1) | KR101041153B1 (en) |
CN (1) | CN101826611B (en) |
AT (1) | ATE527706T1 (en) |
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TWI473319B (en) * | 2012-12-12 | 2015-02-11 | Asustek Comp Inc | Battery module and detecting method thereof |
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-
2009
- 2009-03-04 KR KR1020090018604A patent/KR101041153B1/en active IP Right Grant
-
2010
- 2010-02-24 US US12/711,859 patent/US8557418B2/en active Active
- 2010-02-25 JP JP2010040754A patent/JP5256231B2/en active Active
- 2010-03-03 CN CN201010128614XA patent/CN101826611B/en active Active
- 2010-03-04 AT AT10155469T patent/ATE527706T1/en not_active IP Right Cessation
- 2010-03-04 EP EP10155469A patent/EP2226868B1/en active Active
Cited By (2)
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TWI473319B (en) * | 2012-12-12 | 2015-02-11 | Asustek Comp Inc | Battery module and detecting method thereof |
US9373871B2 (en) | 2012-12-12 | 2016-06-21 | Asustek Computer Inc. | Battery module and detecting method thereof |
Also Published As
Publication number | Publication date |
---|---|
EP2226868A1 (en) | 2010-09-08 |
US20100227205A1 (en) | 2010-09-09 |
CN101826611A (en) | 2010-09-08 |
ATE527706T1 (en) | 2011-10-15 |
US8557418B2 (en) | 2013-10-15 |
CN101826611B (en) | 2013-09-25 |
JP2010205728A (en) | 2010-09-16 |
JP5256231B2 (en) | 2013-08-07 |
KR101041153B1 (en) | 2011-06-13 |
KR20100099983A (en) | 2010-09-15 |
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